How can I invoke TypeScript methods within a jQuery event handler in the ngAfterViewInit lifecycle hook?

Question

How can I invoke TypeScript methods within a jQuery event handler in the ngAfterViewInit lifecycle hook?

I am currently utilizing Angular 4. I need to invoke methods from a typescript file within the ngAfterViewInit method.

 declare var  $;
 @Component({
 selector: 'app-details',
 templateUrl: './details.component.html',
 styleUrls: ['./details.component.css']
})    
export class DetailsComponent implements OnInit ,AfterViewInit{
    ngAfterViewInit(): void {
    $(document).on("hide.bs.modal", function () {
         //this.setValueInsideDetailForm(); This is methods inside typescript file, which I want to call.
     });
    }
  setValueInsideDetailForm(){
       // Some code here.
   }

}

Unfortunately, it results in an error stating that setValueInsideDetailForm is undefined.

javascript angular typescript

Answer 1

Answer №1

Give it a shot:

ngAfterViewInit(): void {
    $(document).on("hide.bs.modal", () => {
        this.updateDetails();
    });
}

To access a method outside the current scope, you must use an arrow function.

firstFunction() {
  console.log('This is my first function');
}

secondFunction() {
  this.firstFunction(); // This works

  function testFunction() {
     this.firstFunction(); // Does not work as it is limited to the testFunction scope
  }

  const testArrowFunction = () => {
    this.firstFunction(); // Works as it is not restricted to the testFunction's scope
  }
}

Answer 2

Give it a shot:

ngAfterViewInit(): void {
    $(document).on("hide.bs.modal", () => {
        this.updateDetails();
    });
}

To access a method outside the current scope, you must use an arrow function.

firstFunction() {
  console.log('This is my first function');
}

secondFunction() {
  this.firstFunction(); // This works

  function testFunction() {
     this.firstFunction(); // Does not work as it is limited to the testFunction scope
  }

  const testArrowFunction = () => {
    this.firstFunction(); // Works as it is not restricted to the testFunction's scope
  }
}

Answer 3

Answer №2

It is essential to ensure that your function captures the correct context from your component. An effective approach is to define a constant self equal to this before using it, and then utilize self throughout.

Take a moment to log this within your callback function to observe the output it generates.

Answer 4

It is essential to ensure that your function captures the correct context from your component. An effective approach is to define a constant self equal to this before using it, and then utilize self throughout.

Take a moment to log this within your callback function to observe the output it generates.

How can I invoke TypeScript methods within a jQuery event handler in the ngAfterViewInit lifecycle hook?

Answer №1

Answer №2

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